I’m not sure how to vote. The only vagina I really like is my own. But then I do like it rather a lot.
On other people I think mouths are nifty. Versatile things. Taste, sound, sensitive to touch. You can use it to store nails while your hands are occupied hammering one into the wall. You can use it as a source of moisture if the face of someone you love (very, very much) is dirty. If you want to feel something that is very small or sensitive, try feeling it with your upper lip. I find it’s more sensitive than my fingertips. Teeth inside the mouth are useful. Never mind munching food, how would you get labels off new clothes without teeth?
OP would have made his poll much clearer if he had specified the question more clearly: Which of your own orifices do you like most, or which of someone else’s orifices to you like most?